Central Bureau for Astronomical Telegrams
IAUC 4712: 1986 III; NSV 01098; ERUPTIVE OBJECT IN Crt
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Read IAUC 4713
Circular No. 4712
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
PERIODIC COMET HALLEY (1986 III)
R. M. West, European Southern Observatory, reports: "Preliminary
inspection of CCD frames obtained under 1".2-1".5 seeing conditions
with the 1.5-m Danish telescope at La Silla totalling about 15 hr of
integration during Jan. 4-9 shows that the activity level of this
comet, now at r = 10.1 AU, has decreased since 1988 May, when similar
observations were last made (West and Jorgensen 1989, A.Ap. in press).
For the nucleus the mean Johnson V = 23.6, or V(1,1,0) = 13.5. The
comet is well visible as a point source near the center of a smooth,
circular, outer coma of diameter 1' at the detection level; the east-
west profile is steepest west of the nucleus. The inner coma seen
last May is no longer present."
NSV 01098
G. M. Hurst, Basingstoke, England, reports that M. Collins, Sandy,
has discovered a variable object at R.A = 3h15m.9, Decl. = +70 37'
(equinox 1950.0) on exposures for the U.K. Nova Patrol. Magnitude
estimates (Kodak 2415 emulsion): 1988 Nov. 2.96 UT, [11; 16.90, 11:;
Dec. 4.91, 10.3; 19.96, 9.3; 28.93, 9.3; 1989 Jan. 10.92 (discovery
observation), 9.3. Hurst remarks that the position agrees with that of
NSV 01098, for which the quoted magnitude (mpg) range is 13.5-[15.5,
although he notes that the object is on the Papadopoulos atlas at mpv
about 9.5 (1977 Sept. 11), and Morgenroth (1936, A.N. 258, 265)
identifies the star with BD +70 0236. Hurst's analysis of other atlases
gives further B magnitudes: 1954 Oct. 30, 14 (Lick); 1969 Aug. 11, [14.5
(Atlas Stellarum).
ERUPTIVE OBJECT IN CRATER
A. V. Filippenko, University of California at Berkeley, reports that
a spectrum (range 600-910 nm, resolution 2 nm) of the eruptive object in
Crater (IAUC 4695, 4696), obtained on Jan. 4 with a CCD spectrograph on
the 3-m Shane reflector at Lick Observatory, shows prominent H-alpha
emission. It is possible that the incorrect star was observed, since no
finding chart was available, but the presence of a strong emission line
makes this unlikely.
1989 January 12 (4712) Brian G. Marsden
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